Uptake of Some Divalent Metal Ions on Layered α-VOPO4.2.5H2O and Its 1,10-Phenanthroline, 2,2′-Bipyridyl and 4,4′-Bipyridyl Intercalated Products

The crystalline layered α-vanadyl phosphate, α-vopo4.2.5h2o, was prepared and characterized. its intercalated products vopo4(1,10-phen)0.33.0.6h2o, vopo4(2,2′ -bipy)0.36. 0.25h2o and vopo4(4,4′ -bipy)0.4, were prepared by direct contact of α-vopo4.2.5h2o with 0.1m organic ligand in ethanol with stirring for 7 days at room temperature. the resulting products were characterized by chemical and thermal analysis. the distribution coefficients (kd values) for a mixture of 0.05m nitric acid solution of the divalent metal ions co2+, ni2+, cu2+, zn2+ , cd2+ and pb2+ were determined simultaneously by (icp) technique after equilibration with vopo4.2.5h2o and its intercalated products at ph 2 and 4. the (kd values) for pb2+ ions were higher than those for other metal ions, especially at ph4. possible selective separation of pb2+ is quite evident. the selectivity order was found to be dependent on the ph and on the nature of the intercalated ligand. partial ligand release of intercalated products at ph 2 observed.